Multiple-speed hydraulic transmission



March 5, l'9249. E. L. HOAGLUND MULTIPLE SPEED HYDRAULIC TRANSMISSIDN 3 Sheets-Sheet '2 Filed June 4. 1928 EZZ/wrjawlaw @5w y March 5, 1929. I E.'| HOAGLUND "1,704,606

MULTIPLE SPEED HYDRAULIC TRANsMIsS-Ior:

Filed June 4. 1928 s. sneets-sneez g5 y' 5t o ZZ o f7 INVENTOR ATTORNEY Patented Mar.'5, v1929..

UNITE- ,-y1,704,606, frfoFFle-Eqfj ELMER LEONARD IroAGLUIID, vor WILKINSBURG, IVENNSYLVAIIIA. l 'j 1 ,ilumina-SPEED HYDRAULIC f rfiaaivsi'zIIssIoILnV Application filed .Tune 4,

This invention relates to improvements in power transmissions.

An object of the invention contemplates l the oblivion of certain speed gears.

` 6 Another object yof the invention comprehends a hydraulic clutch mechanism adapt-` ing novel features and details of construction, to be hereinafter more; fully described,

' 20 illustrated in the accompanying drawings *and pointed out in the appended claim.

Figure 1 is fragmentary side elevation of a fly-Wheel housingand transmission case 25 enclosing the vpresent invention.

Figure 2is`a longitudinal sectional vieWI taken through` the transmission housing. j

Figure 3is a horizontal sectional vievsT taken through the transmission.

invention in section Within the housing and having the housing cover plate removed.

' Figure 5 is a horizontal sectional view taken through the clutch mechanism for the gear.` shafts. j

Figure 6y is a perspective View of thev control mechanism for the hydraulic clutch mechanism.

Referring to the drawings in detail, Wherein like characters of reference denote corresponding parts, the reference character 10 indicates a transmission housing provided With a cover plate 11,l both of Which being adapted for communication vWith ,an 'enlarged housing 12 for a flywheel 13 carried upon a motor or crank shaft 14.

A gear member 15, carried upon the rearmostjprojecting end of the crank shaft 14 positioned Within the housing 10, vis provid# 5o ed with Va countersunk gear face 16 adaptedV for meshing engagement with a slide gear 17 carried upon a splined drive shaftv 18.

Y The slide gear 17 is provided with an annular groove 19 adapted to accommodate the forked extremity 20 of a shift lever 21 mounted for rocking movement, as at 22,

Figure 4' is a top plan view of the present andbridging the spaces of adjacent bypasses 1928,. serial Nol 232,740.7

kWithin the cover, plate 11 of the housing 10.7.v v

'The gear Vteeth upon'the outerperiphery of the gear 15 is meshingly engaged With an idler gear 23 which is in turn connected with a Agear 24. Thegear24 is fixed upon a shaft 25. which alsocarries arreverse gear 26 adjacent its oppositeend. An enlarged gear i 27, carried upon the opposite endvof the 'f slide vgear 17, is adapted torbe meshingly engaged vWith the lreverse gear 26 When the j former is slid upon the splined portion of f the driving ',shaft18 by the gear shift lever 21. l l l From the foregoing description land accompanying drawingsit is manifest that in v the present invention 'all speed'gears arev eliminated.l I f The clutchmechanism, as mentioned in the foregoing, comprises cylinders 28, each lof which Abeingprovidedvvith intake valves 29 adapted to open upon the suction strokes Vof the pistons 30. vConnecting rods 31, having connection With the pistons, are bifurcated upon their opposite ends, as at 32, vto laccommodate ears 33 for pivotal connection with bearings 34 ymounted Within grooves'35 in the outertedges of eccentrics 36.

VA cylinder or sleeve, such as indicated a l 37, housing a differential, is keyedr or other- Wise' fixed,.as indicated at 38, toy the` eccenj trios 36. f f I As illustrated in Figure 3 of the drawings, bypasses 39 Within the cylinders 28, are

defined by plate members 40 spaced from the 90 yends of the vcylinders whereby oil, air or' other agents included Within the housing" will be directed to andv from the opposed sides of the pistons 30 upon the're'spective strokes thereof. j

4'A unit gear y,41, carried upon the innerv most end of the' driving shaft 18, is meshing#V ly engaged With spider gears142 Whichvare also meshingly rengaged with a unit gear 43, carried upon a propeller shaft 44.

Avalve construction, the novel controlA means'for the hydraulic clutch and trans-f mission, .contemplatesa shaft 45 journaled Within the cylinders 38 horizontally thereof in the respective cylinders.

An arm 46, carried upon one of the cylinders, is adapted to journal a reduced end or trunnion 47 projected from the outermost end of the shaft 45. A spur gear 48, includ-` ed upon said outermost end is meshingly engaged'with the teeth 49 of a rack bar 50 Y Vcover plate 11 for the transmission housingf mounted for reciprocating action withinV a guide sleeve l uponthe upper side of the 10. The opposedrend of the rack bar 50 is enlarged and-apertured, as at 51 to accomj 'modate a pivot pin 52 included upon the fad-- :jacent end Vof a'pivoted link 53.

' A foot pedal or othertreadle,such`as. in-

' kdicated at 54k, pivotally mounted, as at 55,

.upon the iioor boards 56 upon thedriving compartment of amotor vehicle, is provided with an ear 57 upon the underside of the free end thereof and which is adapted for pivotal connection with' the uppermost end of the pivoted. link 53.- A spring 58 Vcarried Y upon the lpivot' connection 55 for, the treadle or pedal 54 is adapted to normally retain drawings, the shaft 45 is provided with porsame in the position shown in-Figure l of thedrawings. v

As illustrated in Figures 3 and 6 of the tions removed or ports 59 adapted for selective registration with the spaces provided .at the ends ofthe plates within the cyliny tration with the spaces atl the aforementionedV ends of the plates 40, the oil, airor other agent within the cylinders will be forced through the bypasses by the pist'ons., and it will be noted that the eccentrics will causel the cylinder or differential housing 37 to-rotate in conjunction with the spider gears 42, which willroll against the unit vgears 4l and 43 respectively without imparting any movement to the propeller shaft44. i The particular disposition of the valveJ or shaft 45 is, accomplished by a depressed position of the pedal or treadle 54. In the event the gear 24 is in mesh, the gradual release of pressure against the pedal 54 will gradually close the particular bypasses in the cylinders 28 with a resulting decrease in housing 37. 'Bythe same token, the unit vgear 43 will be turned in conjunction with the propeller 44 whereby power may be transmitted to the rear end construction of Vhen the shaft or tion, the bypasses vwill be/completely-closed and the actions of the pistons 30 kwill'be checked in conjunction with the eccentrics '36 and sleeve 37.

It will thus be noted from the foregoing description and. accompanying drawings that the hydraulic clutch transmission will' impart a gradually increased speed embodying that of the ordinary three speed trans- .mission andwhich also obviatesthe neces'- sity of gear shifting and no slowing up is apparent inasmuch as the gradual, increase of poweris likened to that of throttle acceleration. Y

With. thefpresent invention, any ratio of speed from low to direct drivefinay be accomplished merely by the actuation .of the pedal 54. The velocity attained is not `slackened while changing to'higher speeds/ as there is no need to release theaccelerator. Y

' lGear clashingis eliminated inasmuch as vall exceptytwo `gears are obviated and none to mesh or remesh after the vehicle is once started. Furthermore, instant changes from higher or loweil gears, including neutral position, may be effected with thev cai' in gear.

Although. Ihave described the -inventionjg as beingpriniarily adapted for use'k in conjunction upon motor vehicles, it is obviously understood that the saine could be effectively vemployed for use upon boats or `other vehicles. Y

The invention is susceptible; of various changes in its form, proportions and Vminor ldetails of construction, and the 'right is herein reserved to make such changes as properly fall within the scope of the appended claim.V

Having thus described the invention, what is claimed is V XA hydraulic transmission comprising a housing, a differential included therein, Aa

cylinder for the differential, eccentrics` re-v included within each of the cylinders andi spaced from the 'ends thereof vin juxtaposition to that of the remote positionsl of-thefpistons therefor, and the valve member having acceleration of the cylinder or differential portions removed adapted for communicationwith the interior of each ofthe cylinders through the spaces deiined at the ends. of the partitions. l

In testimony whereof I affix my signature.

nLMnn vLEONARD HoAGLjUND. y 

